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      1 /*
      2  * [The "BSD licence"]
      3  * Copyright (c) 2010 Ben Gruver (JesusFreke)
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 package org.jf.dexlib.Code.Format;
     30 
     31 import org.jf.dexlib.Code.Instruction;
     32 import org.jf.dexlib.Code.LiteralInstruction;
     33 import org.jf.dexlib.Code.Opcode;
     34 import org.jf.dexlib.Code.SingleRegisterInstruction;
     35 import org.jf.dexlib.DexFile;
     36 import org.jf.dexlib.Util.AnnotatedOutput;
     37 import org.jf.dexlib.Util.NumberUtils;
     38 
     39 public class Instruction11n extends Instruction implements SingleRegisterInstruction, LiteralInstruction {
     40     public static final InstructionFactory Factory = new Factory();
     41     private byte regA;
     42     private byte litB;
     43 
     44     public Instruction11n(Opcode opcode, byte regA, byte litB) {
     45         super(opcode);
     46 
     47         if (regA >= 1 << 4) {
     48             throw new RuntimeException("The register number must be less than v16");
     49         }
     50 
     51         if (litB < -(1 << 3) ||
     52                 litB >= 1 << 3) {
     53             throw new RuntimeException("The literal value must be between -8 and 7 inclusive");
     54         }
     55 
     56         this.regA = regA;
     57         this.litB = litB;
     58     }
     59 
     60     private Instruction11n(Opcode opcode, byte[] buffer, int bufferIndex) {
     61         super(opcode);
     62 
     63         this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]);
     64         this.litB = NumberUtils.decodeHighSignedNibble(buffer[bufferIndex + 1]);
     65     }
     66 
     67     public void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
     68         out.writeByte(opcode.value);
     69         out.writeByte((litB << 4) | regA);
     70     }
     71 
     72     public Format getFormat() {
     73         return Format.Format11n;
     74     }
     75 
     76     public int getRegisterA() {
     77         return regA;
     78     }
     79 
     80     public long getLiteral() {
     81         return litB;
     82     }
     83 
     84     private static class Factory implements Instruction.InstructionFactory {
     85         public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
     86             return new Instruction11n(opcode, buffer, bufferIndex);
     87         }
     88     }
     89 }